Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux Consider a 0 25 m thick concrete wall (p 2300 kg m 3 c 880 J kg K, k 1 4 W m K), which is at an initial temperature of T i 25C and irradiated at one surface by lamps that provide a uniform heat flux of ...

KNOWN Thickness initial temperature and thermo physical properties of concrete firewall Incident rad ...

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. Consider

Question:

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. Consider a 0.25-m-thick concrete wall (p = 2300 kg/m³ ∙ c = 880 J/kg. K, k = 1.4 W/m ∙ K), which is at an initial temperature of T_i = 25°C and irradiated at one surface by lamps that provide a uniform heat flux of q"_s = 10⁴ W/m². The absorptivity of the surface to the irradiation is a, = 1.0. If building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°C and 25°C, respectively, after 30 min of heating, win the requirements be met?